package com.atguigu.springcloud.controller;

import com.atguigu.springcloud.entities.CommonResult;
import com.atguigu.springcloud.entities.Payment;
import com.atguigu.springcloud.lb.LoadBalancer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;
import java.net.URI;
import java.util.List;

/**
 * @Author: robert.song
 * @Date: Created in 2021/7/21
 */
@RestController
@Slf4j
@SuppressWarnings("unchecked")
public class OrderController {
    public static final String PAYMENT_URL = "http://CLOUD-PAYMENT-SERVICE/payment";
    @Resource
    private RestTemplate restTemplate;
    @Resource
    private LoadBalancer loadBalancer;
    @Resource
    private DiscoveryClient discoveryClient;

    @PostMapping(value = "/create")
    public CommonResult<Payment> create(Payment payment){
        log.info("create from consumer 80");
        return restTemplate.postForObject(PAYMENT_URL+"/create",payment, CommonResult.class);
    }

    @GetMapping(value = "/get/{id}")
    public CommonResult<Payment> getPayment(@PathVariable("id") Long id){
        log.info("get from consumer 80");
        return restTemplate.getForObject(PAYMENT_URL+"/get/"+id,CommonResult.class);
    }

    /*
     * getForObject：返回响应体中数据转化成的对象，可以理解为json parse to objcet
     * getForEntity：返回的是ResponseEntity的对象，而且包含头信息
     *
     * */
    @PostMapping(value = "/createByEntity")
    public CommonResult<Payment> createByEntity(Payment payment) throws Exception {
        log.info("create from consumer 80");
        ResponseEntity<CommonResult> responseEntity = restTemplate.postForEntity(PAYMENT_URL+"/create", payment, CommonResult.class);
        if(responseEntity.getStatusCode().is2xxSuccessful()){
            return responseEntity.getBody();
        }else
            return new CommonResult(444, "fail operation");
    }

    @GetMapping(value = "/getByEntity/{id}")
    public CommonResult<Payment> getPaymentByEntity(@PathVariable("id") Long id){
        log.info("get from consumer 80");
        return restTemplate.getForEntity(PAYMENT_URL+"/get/"+id,CommonResult.class).getBody();
    }

    @GetMapping(value = "/payment/lb")
    public String getPaymentLB(){
        List<ServiceInstance> instances = discoveryClient.getInstances("CLOUD-PAYMENT-SERVICE");
        if(instances==null||instances.size()<=0){
            return null;
        }
        ServiceInstance serviceInstance = loadBalancer.instances(instances);
        URI uri = serviceInstance.getUri();
        return restTemplate.getForObject(uri+"/payment/lb",String.class);
    }
}
